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About Backflow-Prevention Valves
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Check Valves with Yor-Lok Fittings
Yor Lok Female Inlet × Yor Lok Female Outlet
NPT Male Inlet × Yor Lok Female Outlet
Two sleeves give these fittings extra gripping power. They bite into tubing as you tighten the nut to form a strong seal. All are compatible with Swagelok®, Let-Lok, and Parker A-Lok fittings. Valves open to allow flow in one direction and close when flow stops or reverses.
316 stainless steel valves are more corrosion resistant than brass valves.
Flow coefficient (Cv) is the amount of water (in gallons per minute) at 60° F that will flow through a fully open valve with a difference of 1 psi between the inlet and the outlet.
For technical drawings and 3-D models, click on a part number.
Brass Body
- For Use With: Air, Argon, Helium, Krypton, Neon, Water, Xenon
- Piston Material: Brass
- Spring Material: 316 Stainless Steel
- Seal Material: Buna-N Rubber
| For Tube OD | Flow Coefficient (Cv) | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | End-to-End Lg. | Each | |
Yor-Lok Female Inlet × Yor-Lok Female Outlet | |||||||
|---|---|---|---|---|---|---|---|
| 1/8" | 0.22 | 3,000 psi @ 70° F | 1 | -30° to 275° | 2 3/8" | 000000 | 000000 |
| 1/4" | 0.75 | 3,000 psi @ 70° F | 1 | -30° to 275° | 2 1/2" | 000000 | 00000 |
| 3/8" | 2.09 | 2,300 psi @ 70° F | 1 | -30° to 275° | 3 3/8" | 000000 | 000000 |
| 1/2" | 3.3 | 2,200 psi @ 70° F | 1 | -30° to 275° | 4 1/8" | 000000 | 000000 |
| 3/4" | 6.01 | 1,900 psi @ 70° F | 1 | -30° to 275° | 4 3/8" | 000000 | 000000 |
| 1" | 6.56 | 1,500 psi @ 70° F | 1 | -30° to 275° | 4 5/8" | 000000 | 000000 |
316 Stainless Steel Body
- For Use With: Air, Argon, Helium, Krypton, Neon, Water, Xenon
- Piston Material: 316 Stainless Steel
- Spring Material: 302 Stainless Steel
- Seal Material: Fluoroelastomer Rubber
| Pipe Size  | For Tube OD | Flow Coefficient (Cv) | Max. Pressure | Min. Opening Pressure, psi | Temperature Range, °F | End-to-End Lg. | Each | |
Yor-Lok Female Inlet × Yor-Lok Female Outlet | ||||||||
|---|---|---|---|---|---|---|---|---|
| __ | 1/8" | 0.1 | 3,000 psi @ 70° F | 0.33 | -10° to 375° | 2 1/4" | 00000000 | 0000000 |
| __ | 1/4" | 0.47 | 3,000 psi @ 70° F | 0.33 | -10° to 375° | 2 3/8" | 00000000 | 00000 |
| __ | 3/8" | 1.47 | 2,300 psi @ 70° F | 0.33 | -10° to 375° | 2 1/2" | 00000000 | 000000 |
| __ | 1/2" | 1.68 | 2,200 psi @ 70° F | 0.33 | -10° to 375° | 3" | 00000000 | 000000 |
| __ | 3/4" | 4.48 | 1,900 psi @ 70° F | 0.33 | -10° to 375° | 3 1/2" | 00000000 | 000000 |
| __ | 1" | 4.48 | 1,500 psi @ 70° F | 0.33 | -10° to 375° | 4 3/4" | 00000000 | 000000 |
| __ | 6mm | 0.47 | 3,000 psi @ 70° F | 0.33 | -10° to 375° | 2 3/8" | 00000000 | 000000 |
| __ | 10mm | 1.68 | 3,000 psi @ 70° F | 0.33 | -10° to 375° | 2 1/2" | 00000000 | 000000 |
| __ | 12mm | 1.68 | 3,000 psi @ 70° F | 0.33 | -10° to 375° | 3 1/16" | 00000000 | 000000 |
NPT Male Inlet × Yor-Lok Female Outlet | ||||||||
| 1/4 | 1/4" | 0.47 | 3,000 psi @ 70° F | 0.33 | -10° to 375° | 2 1/8" | 00000000 | 000000 |
| 3/8 | 3/8" | 1.47 | 3,000 psi @ 70° F | 0.33 | -10° to 375° | 2 1/16" | 00000000 | 000000 |
| 1/2 | 1/2" | 1.68 | 3,000 psi @ 70° F | 0.33 | -10° to 375° | 2 7/8" | 00000000 | 000000 |